The ECS and MARECS satellites are discussed. Both satellites are based on OTS concepts. A service module provides power, attitude control, and telemetry tracking and command. It is built around a central thrust cone which houses an apogee boost motor. A horizontal equipment platform carries the service units. The satellites are three axis stabilized, using information from IR Earth sensors to control a one degree of freedom system with two fixed momentum wheels and one transverse momentum wheel. East/west stationkeeping, is achieved by hydrazine thrusters. The power required for MARECS is 760 W dc, for ECS 915 W dc. Two MARECS spacecraft are destined for a global maritime communications network. Passive intermodulation is a problem with MARECS. Polarization problemable occur with ECS front fed elliptical antennas.
The ECS/MARECS Spacecraft Design and Programme Status
1980
19 pages
Report
Keine Angabe
Englisch
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